US Bridges

41390 251 Street over Rock Ck

Poor

Hanson County, South Dakota · 1.0N & 5.1W of Fulton Sd · Structure no. 000000031019070

Built
1963
62 years old
Condition
Poor
inspected July 2023
Type
Tee Beam
Concrete
Length
33 ft
1 main span
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

41390 251 Street over Rock Ck is a concrete tee beam carrying 41390 251 Street over Rock Ck in Hanson County, South Dakota. It was built in 1963, so it is 62 years old, older than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 30 vehicles a day, projected to reach 30 by 2042. The structure is 33 ft (10.1 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries41390 251 Street
CrossesRock Ck
Location1.0N & 5.1W of Fulton Sd
RouteCounty Highway 0
Coordinates43.74667, -97.92949
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span32 ft (9.8 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic30 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$150,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 41390 251 Street over Rock Ck built?

It was built in 1963, making it 62 years old in 2025.

What condition is 41390 251 Street over Rock Ck in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does 41390 251 Street over Rock Ck carry?

About 30 vehicles per day (2022 count).

How long is 41390 251 Street over Rock Ck?

The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 25 ft wide.

Who owns 41390 251 Street over Rock Ck?

It is owned by the County Highway Agency.